This is a bit strange. The download page always works as its just a file on a server. There must be an issue with your connection or your machine. This is just a dumb file - there is no way it can fail other than a loss of connection. All patches are cumulative so all you need is this one. What is the file size after downloading? What is the new error message and it cant be the original one as that comes from the updater.

Sorry for the late response. The engine is in redevelopment. The old code has been thrown away and developed from scratch. This means any bugs in the old code cant be fixed right now but we hope to release a much better version soon. The beta will be starting in the next few weeks. Anyone with the current version will get the new version for free.